Fracture Damage Characteristics of Rock Under Pre-Peak and Post-Peak Cyclic Loading Condition

doi:10.16183/j.cnki.jsjtu.2021.119

Abstract

Abstract:

In the process of rock excavation, cyclic loading may occur before or after the peak value. In order to obtain the fracture damage evolution characteristics of rock under the pre-peak and the post-peak cyclic loading condition, the fracture tests of three-point bending granite beams were conducted by using the digital image correlation method and the acoustic emission technology. Based on the secant modulus, the acoustic emission energy and effective crack length, the rock fracture damage indexes D_E, D_AE, and D_L were constructed respectively, and the rock fracture damage process was quantitatively analyzed. The results show that the damage index of the rock sample has an obvious rate effect. At the same number of cycles, as the loading rate increases, the damage index decreases. For the pre-peak cyclic loading condition, the fracture process of rock from elastic stage to elastic-plastic stage can be well reflected by D_E. Under the condition of post-peak cyclic loading, D_L can better represent the fracture damage process of rock from step up to continuous failure.

Key words: cyclic loading, rock fracture, damage index, acoustic emission, effective fracture length

CLC Number:

TU45

TANG Jianhui, CHEN Xudong, BAI Yin. Fracture Damage Characteristics of Rock Under Pre-Peak and Post-Peak Cyclic Loading Condition[J]. Journal of Shanghai Jiao Tong University, 2022, 56(12): 1700-1709.

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加载工况	试样编号	加载速率	卸载速率/(kN·s^-1)
峰前循环加载	1#	0.1 kN/s	0.1
	2#	0.5 kN/s	0.5
	3#	1 kN/s	1
峰后循环加载	4#	0.001 mm/s	0.2
	5#	0.005 mm/s	0.2
	6#	0.01 mm/s	0.2